The BEST science videos on YouTube. Winner of many online video awards. Worth checking out!
The Khan Academy

Zerobio.com - grade 12 Biology site (games, reviews, worksheets)
zerobio.com

Online quizzes on a variety of biology topics
biologycorner.com

Quizzes for each chapter in your textbook
http://www.nelson.com/nelson/school/secondary/science/0176259872/studquizzes.html

Help with referencing in APA Style:
Bibme
Citation Machine
Tutorial on citing sources
APA Citations for Electronic Sources

Web 2.0 Tools for creating documents or presentations:
Google Docs
Prezi's
Glogster (online posters)
Animoto (create short photo slideshows to music)
Turnitin

Graphing Programs
Kid's Zone: Create a Graph Classic
chartgo.com
http://www.graphtools.com/line.html

Sources for Research Projects:

EBSCO Host search engine, can be accessed through the school website:
Username is chss
Password is ebsco

US National Library of Medicine, National Institutes of Health - online source for medicine related articles
PubMed

Google Books

Google Scholar for Journal Articles